Index 



433 



PAGE 



pitcher-plant 283, 284, 350, 351 



Pitot-tube current meter 86 



Placobdella 176 



Plagiola 289, 291 



Plagues of Egypt 14 



Planaria 263 



planarians 1 70, 171 



plancton 18, 20, 28, 45, 48, 49, 

 70, 72, 85, 123, 129, 130, 

 131, 134, 135, 161, 164, 166, 

 185, 189, 194, 235, 243, 294 

 295, 296, 299, 300, 301, 302, 

 303, 313, 322, 341, 356, 357, 

 387, 388, 389, 391, 394 



plancton animals 299, 301, 325 



Crustacea 391 



entomostraca 393 



feeders 235 



gatherers 263, 270 



local abundance 306 



net 115, 160 



of open waters 331 



organisms 248, 296 



pulses 305 



shoreward range 307 



of surface 327 



plancton strainers 313 



planctonts, summer 309 



" synthetic 308 



Planorbis. .... 155, 182, 337, 345 



plant assimilation 26 



plant infusions 160, 165 



plants, chlorophyl-bearing . . . 44, 326 



floating 150 



insectivorous 282, 283 



submerged 155, 334 



transpiration of 56 



vascular. . .270, 316, 322, 356 



Platydorina 104 



Platypeza 380 



pleasure grounds 21 



Plecoptera 195, 203 



Pleurotaenium 119 



pliancy 271 



Ploesoma 299 



plover 239 



Plumatella 166, 167, 169 



plumes 248 



plunge basins 63 



Podilymbus 240 



Podophrya 1 62 



pollen grains 296 



pollen tubes 151 



PAGE 



Polyarthra 299, 300 



Polycystis 297 



Polycentropus 340 



Polygonum 75, 344, 345 



Polyphemus 301 



Polytrichium 351 



Polyzoans 166 



pond culture 393 



pond-dwellers 172 



pond at Lake Forest, 111 410 



pond, making of a 406 



Pond, Old Forge 388 



Pond, Parker's 91 



pond-scums loi 



pond-snails 327 



pondweed, ruffled 152, 272 



sago 326, 380, 387 



pondweeds 152, 153, 240, 272, 319, 

 321, 334. 352, 391. 



405 



pondweed zone 232, 233 



ponds 59, 121, 155, 167, 299, 307, 316, 



333, 345, 356, 397 



ponds, hatching 163 



" inclosed 408 



Pontederiaceae 156 



Pontederia 157, 321, 334 



pools 14, 57, 64, 81, 133, 156, 163, 

 164, 184, 210, 307, 316, 319, 322, 

 356 



pools, impermanent 157 



" polluted 173 



** rainwater 184 



" stagnant 127, 139, 160 



'* temporary 177, 227, 263 



Potamogeton 152, 153, 220, 240, 321, 



334, 336, 387 



Potentilla 344 



prawn, freshw^ater 393 



prawns 183, 192 



Precession of the Equinoxes. .. . 32 



precipitation 55 



Priocnemis 330 



production, decline of 310 



products, animal 382 



" gelatinous 244, 245 



" metabolic 244 



'* mucilaginous 245 



prolongations 245 



propagation 385, 398 



propagation, artificial 397 



propulsion 249, 250 



propulsion, caudal 279 



